<div class='div1'></div>
<div class='div2'></div>
.div1 {
  width: 300px;
  height: 100px;
  background: red;
}

.div2 {
  width: 300px;
  height: 100px;
  background: green;
  padding: 10px;
  box-sizing: content-box;
}

External CSS

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External JavaScript

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